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Bridge
Density-based topology optimization (SIMP)
Orthogonal domain (box) loaded on the top surface and supported by thin strips at opposite edges on the bottom face. The bridge deck is represented by a passive-solid region (not a variable).
"Bridging topology optimization and additive manufacturing." T. Zegard and G. H. Paulino. Journal of Structural and Multidisciplinary Optimization 53(1), 2016.